<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<style>
    div{
        /* overflow: hidden; */
        height: 90vh;
    }
    .item{
        height: 30px;
    }

</style>
<body>
    <div>
        <div class="item">dsds</div>
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        <div class="item">dsds</div>
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    </div>
</body>
</html>